Description

This track shows the differences between the GRCh38 (hg38) and previous GRCh37 (hg19)
human genome assemblies, indicating contigs (or portions of contigs) that are new
to the hg38 assembly.

The following color/score key is used:

color

score

change from hg19 to hg38

0

New contig added to
hg38 to update sequence or fill gaps present in hg19

500

Different portions
of this same contig used in the construction of hg38 and hg19 assemblies

1000

Updated version of
an hg19 contig in which sequence errors have been corrected

Use the score filter to select which categories to show in the display.

Methods

The contig coordinates were extracted from the AGP files for both assemblies.
Contigs that matched the same name, same version, and the same specific
portion of sequence in both assemblies were considered identical between the two
assemblies and were excluded from this data set. The remaining contigs are shown
in this track.

Credits

The data and presentation of this track were prepared by
Hiram Clawson, UCSC Genome
Browser engineering.